I had the P-series with my Canon kit, but sold it all off when I switched to :43:. The lens adapters don't go down to small enough sizes for some of the :43: lenses. The filters themselves are pretty good, although some (like their polarizer) are rather expensive.

What I ended up doing was buying a set of filters sized for the biggest lens I thought I would have and then step up rings to adapt them down to the smaller lenses. Worked out to be both cheaper and simpler.

Amazon has a P-series holder with a 52mm adaptor ring. My Pany 14-45 and 45-200 both use that filter size. Would that work, or is that is a no go?

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I'd say that would work fine. Check min and max filter size for the P, but it should work. I'd only use this for graduated ND's, however. If you just want even blocking of the light I'd go with a screw-on filter. As suggested earlier, get one for your largest lens and then get step up rings.

I suggest screw on filters for solid ND because a Cokin holder gets pretty awkward.

I've also read suggestions to just hold an ND grad in place by hand, instead of using a holder.

Sometimes a good alternative to an ND grad is multiple exposures blended together, too.

If you want truly neutral ND filters then LEE are great, but much, much more expensive and their smallest size is 75mm wide (same as the defunct but excellent value Hoyarex). However they do a 37mm adapter ring.

If anyone knows of an 'A-size' brand that delivers a neutral ND I'd love to know.

I wanted to ask for the Z pro cokin filters. I dont want to hijack this thread. but someone would tell me whats their experience in between the P and Z pro series?!?!?.

Im asking this cause both would have an adapter ring for my P12-35 (ø58) but ive read that the P series might have some serious vignetting on the 12mm (24mm) end? but ive read some saying the same for the Z pro?.

Make sure the lens you are putting them on are internal focusing or else these heavy adapters and filters can add a lot weight to the front of the lens and could cause strain and damage the focus motor unless you shoot manually.

I use singh rays with cokin P's to good effect. At wide angles with the 7-14 some vignetting I've noticed starts around 8mm. nothing too noticable or even hard to correct. The worst is if you place the holder wrong you'll get the holder in frame. I used an off branded model that worked fantasic, I beleive it was a Goja P series holder. If you have a larger framed camera, I would suggest using an cokin x pro or lee depending on your budget, as you can use the filters on m4/3 as well on your larger diameter front elements.